With the cmd 2a, only specific buttons change color when the midi scripts are running. In order for you to get further assistance, I need to see what your midi controller configuration within deckadance looks like so I know what your working with.

Guest Script Writer (IE, I do not work for Stanton, Gibson, or any of their associated brands, nor do I work any other companies who are in the industry. This also means I do not get any compensation for the scripts I write. All scripts that are written by me and all help given by me is to be acknowledged as one user helping another.)
Author of the Numark DJ2GO script for Deckadance (included in 2.72)
Author of the Numark Orbit script for Deckadance (included in 2.72)
Author of the updated version of the script for the M-Audio Xponent (included in 2.72)
Author of the Akai APK Mini script for Deckadance (included in 2.72)
Author of the Numark Mixtrack 3 script for Deckadance (included in 2.72)
Deckadance user since 2014
FL Studio user since 2013

There can be an error with the firmware of the CMD2A. If it's configured to receive MIDI messages by a MIDI channel different than one then the leds won't change. If this is the case then you will have to use the program "CMD channel changer" to change CMD2A's MIDI input channel (...it must to be channel 1). Here is a link with the instructions: https://musicgroup-p...D_Controller%3F

It's a firmware setup problem more than a bug and it only happens in a few units (...the rule is that the units receive MIDI messages by channel 1). It can happen in whatever model of the CMD line because the firmware is similar (...you can change the MIDI input/output channel in all of them).